| Schlüssel Schlüssel. Schlüssel or "Key" in English, is a puzzle by the infamous "Roger D". Roger D is a mysterious puzzle designer from Germany, and his actual identity is known only to a few. Roger is known throughout the puzzling world for his extremely difficult and high quality machined aluminum puzzles. Roger's puzzles are produced in relatively small numbers and are highly collectible, they are also sold- Schlüssel. |
